<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=15948) </details> <!--IssueSummary end--> ### Description In Mattermost/Slack there is no special image and no name for incoming webhook messages. ### Proposal GitLab should set the `icon_url` to either GitLab logo or to the projects logo. And the `username` to `GitLab`. ### Links / references  #### API references: - https://docs.mattermost.com/developer/webhooks-incoming.html (scroll down) - https://api.slack.com/incoming-webhooks